const state = {
    visitedViews: [],
    cachedViews: [],
    iframeViews: []
  }
  
  const mutations = {
    ADD_IFRAME_VIEW: (state, view) => {
      if (state.iframeViews.some(v => v.path === view.path)) return
      state.iframeViews.push(
        Object.assign({}, view, {
          title: view.meta.title || 'no-name'
        })
      )
    },
    ADD_VISITED_VIEW: (state, view) => {
      if (state.visitedViews.some(v => v.path === view.path)) return
      state.visitedViews.push(
        Object.assign({}, view, {
          title: view.meta.title || 'no-name'
        })
      )
    },
    ADD_CACHED_VIEW: (state, view) => {
      if (state.cachedViews.includes(view.name)) return
      if (view.meta && !view.meta.noCache) {
        state.cachedViews.push(view.name)
      }
    },
    DEL_VISITED_VIEW: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews.splice(i, 1)
          break
        }
      }
      state.iframeViews = state.iframeViews.filter(item => item.path !== view.path)
    },
    DEL_IFRAME_VIEW: (state, view) => {
      state.iframeViews = state.iframeViews.filter(item => item.path !== view.path)
    },
    DEL_CACHED_VIEW: (state, view) => {
      const index = state.cachedViews.indexOf(view.name)
      index > -1 && state.cachedViews.splice(index, 1)
    },
  
    DEL_OTHERS_VISITED_VIEWS: (state, view) => {
      state.visitedViews = state.visitedViews.filter(v => {
        return v.meta.affix || v.path === view.path
      })
      state.iframeViews = state.iframeViews.filter(item => item.path === view.path)
    },
    DEL_OTHERS_CACHED_VIEWS: (state, view) => {
      const index = state.cachedViews.indexOf(view.name)
      if (index > -1) {
        state.cachedViews = state.cachedViews.slice(index, index + 1)
      } else {
        state.cachedViews = []
      }
    },
    DEL_ALL_VISITED_VIEWS: state => {
      // keep affix tags
      const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
      state.visitedViews = affixTags
      state.iframeViews = []
    },
    DEL_ALL_CACHED_VIEWS: state => {
      state.cachedViews = []
    },
    UPDATE_VISITED_VIEW: (state, view) => {
      for (let v of state.visitedViews) {
        if (v.path === view.path) {
          v = Object.assign(v, view)
          break
        }
      }
    },
    DEL_RIGHT_VIEWS: (state, view) => {
      const index = state.visitedViews.findIndex(v => v.path === view.path)
      if (index === -1) {
        return
      }
      state.visitedViews = state.visitedViews.filter((item, idx) => {
        if (idx <= index || (item.meta && item.meta.affix)) {
          return true
        }
        const i = state.cachedViews.indexOf(item.name)
        if (i > -1) {
          state.cachedViews.splice(i, 1)
        }
        if(item.meta.link) {
          const fi = state.iframeViews.findIndex(v => v.path === item.path)
          state.iframeViews.splice(fi, 1)
        }
        return false
      })
    },
    DEL_LEFT_VIEWS: (state, view) => {
      const index = state.visitedViews.findIndex(v => v.path === view.path)
      if (index === -1) {
        return
      }
      state.visitedViews = state.visitedViews.filter((item, idx) => {
        if (idx >= index || (item.meta && item.meta.affix)) {
          return true
        }
        const i = state.cachedViews.indexOf(item.name)
        if (i > -1) {
          state.cachedViews.splice(i, 1)
        }
        if(item.meta.link) {
          const fi = state.iframeViews.findIndex(v => v.path === item.path)
          state.iframeViews.splice(fi, 1)
        }
        return false
      })
    }
  }
  
  const actions = {
    addView({ dispatch }, view) {
      dispatch('addVisitedView', view)
      dispatch('addCachedView', view)
    },
    addIframeView({ commit }, view) {
      commit('ADD_IFRAME_VIEW', view)
    },
    addVisitedView({ commit }, view) {
      commit('ADD_VISITED_VIEW', view)
    },
    addCachedView({ commit }, view) {
      commit('ADD_CACHED_VIEW', view)
    },
    delView({ dispatch, state }, view) {
      return new Promise(resolve => {
        dispatch('delVisitedView', view)
        dispatch('delCachedView', view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delVisitedView({ commit, state }, view) {
      return new Promise(resolve => {
        commit('DEL_VISITED_VIEW', view)
        resolve([...state.visitedViews])
      })
    },
    delIframeView({ commit, state }, view) {
      return new Promise(resolve => {
        commit('DEL_IFRAME_VIEW', view)
        resolve([...state.iframeViews])
      })
    },
    delCachedView({ commit, state }, view) {
      return new Promise(resolve => {
        commit('DEL_CACHED_VIEW', view)
        resolve([...state.cachedViews])
      })
    },
    delOthersViews({ dispatch, state }, view) {
      return new Promise(resolve => {
        dispatch('delOthersVisitedViews', view)
        dispatch('delOthersCachedViews', view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delOthersVisitedViews({ commit, state }, view) {
      return new Promise(resolve => {
        commit('DEL_OTHERS_VISITED_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delOthersCachedViews({ commit, state }, view) {
      return new Promise(resolve => {
        commit('DEL_OTHERS_CACHED_VIEWS', view)
        resolve([...state.cachedViews])
      })
    },
    delAllViews({ dispatch, state }, view) {
      return new Promise(resolve => {
        dispatch('delAllVisitedViews', view)
        dispatch('delAllCachedViews', view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delAllVisitedViews({ commit, state }) {
      return new Promise(resolve => {
        commit('DEL_ALL_VISITED_VIEWS')
        resolve([...state.visitedViews])
      })
    },
    delAllCachedViews({ commit, state }) {
      return new Promise(resolve => {
        commit('DEL_ALL_CACHED_VIEWS')
        resolve([...state.cachedViews])
      })
    },
    updateVisitedView({ commit }, view) {
      commit('UPDATE_VISITED_VIEW', view)
    },
    delRightTags({ commit }, view) {
      return new Promise(resolve => {
        commit('DEL_RIGHT_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delLeftTags({ commit }, view) {
      return new Promise(resolve => {
        commit('DEL_LEFT_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
  }
  
  export default {
    namespaced: true,
    state,
    mutations,
    actions
  }
  